Pole-piece-fastening device.



J. D. FIRMIN.

' POLE PIECE FASTENING DEVIGE.-

APPLIOATION FILED SEPT.14, 1905 Fy-z- I m If A? m i I I ZZ'I. I i 12 14i F y" W- DL/P 7 u 4' 0 Inventor: Mhzesses tj hn fi- Hrmz'n A ttorn g7Patented May 25, 1909-.

JOHN D. .liTIRMIN, ,O,F PLEASANTBIDGE, OHIO,. ,ASSIG LOR T THE BILLIJQQK ELECTRIC MAINE .EACIULRING COMPANY, A CQRBGRATION QF 9510.

POIIE PIECE -FASTENING DEVIC E.

Specification of Letters Patent.

Application filed September 21A, 11905. Ger-m1 No.;278;fi26.

Patented-May 19(39- '-.To' all whom it may concern:

Ridge, in the-county of Hannltonaand State of Ohio, have Inventedcertain newand use 7 thread. the holes drilled in theen pole pieces andif thethreads in'one of thef faces.

having been insertedin place. I My invention, from a more specific standful Improvements in .Pole-'-Piece' l astening machines andespeciallyto'the means-forfast-cnlng laminated pole pieces to fi-el'dframes. 3

Heretofore'it has'been-customary to fasten laminated pole pieces'tofield trames by means of'bolts Which-are screwedinto tapped radial holesin the outer faces of the pole pleces or by meansof boltswhichare-screwed into bars which-extendtransversely through the pole piecesor by through-bolts which pass entirelyfthrough the pole pieces, the

heads being recessed into the inner pole The -first method isobjectionable for'the reason =that-it :is difficult tot-lproperly or theholes are injured -.or improperlycut the *pole" I piece is practicallyruined. The second" method is objectionable "for ithe reason that thetransverse .rods of considerable size are required, thus necessitatingthe cutting away of considerable area of each lamina.

(Inc of the objects of my invention is ito secure thc'laminated polepiece to the field frame or yoke and to lock the boltsinplace yvilthoutnecessitating considerable cost or" a or.

A further dbjectis to :provide a holding means which willbesimple andone which will permit the parts to'be or taken apart when desire Incarrying out In invention l rovi de a -po1e piece with 'attac 'ng boltor bo ts which are locked in position in the polepiecectfter point,consists in afield frame of a dynamo electric machine having a pluralityof laminated pole pieces each of which is secured to the field frame bybolts extending through the latter into the pole-piece, said bolts beinglocked or anchored in place in the pole piece by a rod or bar whichextends transversely through openings in the lamina and bolts. *7

For a more complete-understanding of my (prickly assembledinvention-reference ishad to the-accompany- Be it known that 1, JOHN D.Framer, (Hill-5 zenof the United States-residing atPleasant ing drawingsin which- Figure il showsra partial end-view andpartial sectionalelevation of a railway motor having myinvention applied thereto; Fig. 2is a transverse sectionoflaportion of afield frame and pole piece,:parts being shownin elevation-rand and 4areside and end viewsrespectively of the locking rod or bar 'usedin -my-'invention.

I'have-shoWn-my invention as appLe-d to a railwa motor, but it isevident thatit-is applicab e .to type o'fdynamo electric machine havingaminatedole )ieces. I'have shown at IO-a casing am field frame oryoke ofa railway motor whichmasing is shown as divided into two portions alongthe line -of the-shaft, as-in'the customary manner. 'Ex- *tending Wardlfrom the field frame are a plurality of oil; pieces. Each pole piececonsists of aiiundle oflaminee 11 riveted or ibolted together and to theside plates 12,by rivets or bolts 13, which pass transversely throughthe laminae as in the customary 'manner. As is shown in Fig. 1 thelaminated ole pieces are provided with curved outer aces which ablitagainst .curved prm jectingfaces on "the-field frame. In this in stanceeach pole piece is fastened to the field frame by two "bolts '14, whichpass through the field frame into the pole piece. 'These bolts areprovided-attheir outer ends with 'nutsj15 and washers 115 which restuponfla't faces "16 on'the outer surface of the The holes which receivethe bolts are preferably drilled into the laminae after they have beenassembled. 'If desired 'howeverthe openin s can be punched in-thelaminae se arate'ly efore they are assembled. To old the pole pieces andbolts in positionl lock-thebolts to the pole pieccsfby transverse rodsor bars 17, which extend through openings 18 in the laminae and openings 19 in the attaching bolts. The openings 18in'thelaminie arepreferably punched therein. As is shown most clearly in Figs. 2 and 3the locking'bar is rovided on its inner side with notches 20, w iichnotches W8 6i gaged by the bolts to prevent displacement of the lockingbar.

- Each pole piece is rovided with a field coil 21 mounted on a rame 22,which frame rests on shoulders 23 adjacent to the inner face of thelaminae. 'l he parts are assen1- .10 bolted to the frame.

is desirci'l to remove thebarthe bled as follows: The laminae and sidela-tes 12 are first riveted together. The ho ts 14 are next inserted inthe radial holes, provided in the outer face of each pole piece for thatpurpose, and are locked in position by a all he perforated, but may heprovided with notches or any other means as heads or projections forengaging the locking bar. It is also evident that either more or lessthan two attaching bolts may be employed for securing each pole piece tothe frame.

It will be seen that my structure requires no considerable cost orlabor. The bar 17 is preferably made of steel and may be comparativelysmall in size. It will thus be seen that only small openings need bepunched in tliela-minzc to receive the rods l7 and theretorea; hotternm-gnetic condition will result thanin he structures previouslyemployed. A ift will also be seen that as none of the punch- !1'56'.logs are out entirely in half only two rivets i re: uired to keep thelaminar in alinel aim in my claims .to cover all modifications which donot depart irom thc spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent is:-

1. In a dynammelcctric machine, a field frame, a laminated pole piecc, aboh extending through the frame into the polc piece,

means for anchoring the bolt into the pole piece comprising a memberextending transversely intothc pole piece and inter-docking with saidbolt alter the latter has been inso seited the full distance into thepole piece,

and means at the o 'iposite end of the bolt for drawing the end ol' thepole piece against the frame.

2;; In a dynamo-elcctric machinc, av lleld frame, a laminated pole piecehaving a lougitudinelfor radial opcuing and a transverse opening, a boltextending through the frame and seated in said longitudinal or radialopening, said bolt having a slot in elinemem G0 with the transverseopening in the pole piece,

The notches 20 provide against accimeans 't'or anchorpiece comprisingthe transverse 0p engaging in the the outer end of the t of the polepiece tightly gi frame. y z

3. In a dymuno-electricMachine, a held frame, a laminated pole i a boltpassing through the frame inio ole iece, mcans for anchoring the b-oltin thcgmle piece comprising a mcmbcr extend ng trausrcl'sely into thepole piece and through the boltandmeans engaging the outer end ofihcjboltfiqir drawing the pole li1'nily'wlgzilust the frame.

4. In 'a dynamo-electric *machium a lield frame, a la nated pole piece.a plurality of bolts passing through the lramcinto the pole piece, amember passing trai'isvcrscly through the lmuinzeaml through rhcboltsfor anchoring the latter in the polc piccc, and means engaging theouter ends ol' llH- bolts for drawing the pole picce tightly against thefield frame.

5. in a. dyiiamo-electric machiuc. a licld frame, :clau'iinated polepiecc, av perforated attaching bolt extending through the l'ramc intothe pole piece, means passing U'u]is vcrsely through the laminae andthrough the erl'oraliou in the liolt l'. r anchoring the latter in thepole piece, and n'ljraus engaging [lit a I i I a the outer or lrcc endol the bolt lor drawing,

the end ol' the pole piccc tightly against the iicld l'ramc. I I

6. ln 2t dynamo electric machine, a lield frame or yoke, a pole )ieccconsisting of laminae having aliucd perloralions, a bolt extendingthrough the frame or yoke into the lamina; and having it perforationregistering with the perforations in thcdamiuzc, and alocking rod or barexlcnding through the perforations in the lamiuzc and bolt tolock thelatter in place.

7. In a dynamo electric machine. a iield frame or yoke, 2L laminatedpole piece, a pair of attaching bolts provided with perforationsextending through thc frame into the pole piece, and a locking rodhaving a pair of notches on the under sidc thereof, said locking rodpassing transversely through the lamina and attaching bolts and lmvingits notches engaged by the bolts whereby the bolts and rod are locked'inplace.

in testimony whereof I allix my signature, in the presence of twowitnesses.

JOHN l). FlliMlN.

\lituesses:

.lu'ruuu l Kwis, lanu J. luxsnr.

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